The 60% Schedule

A good rule of thumb is to schedule no more than 60% of your day, because planning is not an exact science, and you never know what interruptions, unforeseen opportunities, problems, and other unexpected activities can encroach on your schedule.

Cal Newport’s Scheduled Day

This is a great article showing you how Cal Newport, author of Deep Work, schedules his day down to the minute. Deep Habits: The Importance of Planning Every Minute of Your Day